1. Support PCIe 5.0X4 compatible with Gen3, Gen4, and Gen5. 2. Exclusive design of support base plate, R27A is applicable to U.2 hard disks. 3. Gold finger gold-plated process, gold thickness to 10U. 4. High frequency low resistance high temperature anti oxygen PCB board, no deformation color semi- parent no white no black. 5. The D2 indicator of R27A is the power indicator, and the D1 indicator is the read/write indicator. Normally, the D1 indicator is steady on, and the D2 indicator blinks in the read/write state. Product Model: R27A Product Name: PCIe 5.0 x4 to U.2 (SFF-8639) Adapter Card Speed Bandwidth: PCIe 5.0 x4 Colour:black Material:PCB Please note: ssd or heatsink not included. Due to different batches, there may be differences in product appearance and printed text, which not affect use Package Contents: 1 * PCIe 5.0 x4 to U.2 (SFF-8639) Adapter Card Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.